Implement proper synchronization between HW video decode IPC and CommandBuffer.

content/common/gpu/media/omx_video_decode_accelerator.h

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_COMMON_GPU_MEDIA_OMX_VIDEO_DECODE_ACCELERATOR_H_
 #define CONTENT_COMMON_GPU_MEDIA_OMX_VIDEO_DECODE_ACCELERATOR_H_
 
 #include <dlfcn.h>
 #include <map>
 #include <queue>
@@ skipping 19 matching lines @@
 class OmxVideoDecodeAccelerator : public media::VideoDecodeAccelerator {
  public:
   OmxVideoDecodeAccelerator(media::VideoDecodeAccelerator::Client* client,
                             MessageLoop* message_loop);
   virtual ~OmxVideoDecodeAccelerator();
 
   // media::VideoDecodeAccelerator implementation.
   bool GetConfigs(const std::vector<uint32>& requested_configs,
                   std::vector<uint32>* matched_configs) OVERRIDE;
   bool Initialize(const std::vector<uint32>& config) OVERRIDE;
-  bool Decode(const media::BitstreamBuffer& bitstream_buffer) OVERRIDE;
+  void Decode(const media::BitstreamBuffer& bitstream_buffer) OVERRIDE;
   virtual void AssignGLESBuffers(
       const std::vector<media::GLESBuffer>& buffers) OVERRIDE;
   virtual void AssignSysmemBuffers(
       const std::vector<media::SysmemBuffer>& buffers) OVERRIDE;
   void ReusePictureBuffer(int32 picture_buffer_id) OVERRIDE;
-  bool Flush() OVERRIDE;
-  bool Abort() OVERRIDE;
+  void Flush() OVERRIDE;
+  void Abort() OVERRIDE;
 
   void SetEglState(EGLDisplay egl_display, EGLContext egl_context);
 
  private:
   // Helper struct for keeping track of the relationship between an OMX output
   // buffer and the GLESBuffer it points to.
   struct OutputPicture {
     OutputPicture(media::GLESBuffer g_b, OMX_BUFFERHEADERTYPE* o_b_h)
         : gles_buffer(g_b), omx_buffer_header(o_b_h) {}
     media::GLESBuffer gles_buffer;
@@ skipping 110 matching lines @@
                                     OMX_PTR event_data);
   static OMX_ERRORTYPE EmptyBufferCallback(OMX_HANDLETYPE component,
                                            OMX_PTR priv_data,
                                            OMX_BUFFERHEADERTYPE* buffer);
   static OMX_ERRORTYPE FillBufferCallback(OMX_HANDLETYPE component,
                                           OMX_PTR priv_data,
                                           OMX_BUFFERHEADERTYPE* buffer);
 };
 
 #endif  // CONTENT_COMMON_GPU_MEDIA_OMX_VIDEO_DECODE_ACCELERATOR_H_